[PATCH v2] drm/bridge: tc358767: fix uninitialized variable regression

[PATCH v2] drm/bridge: tc358767: fix uninitialized variable regression

[Luca Ceresoli]

Commit a59a27176914 ("drm/bridge: tc358767: convert to
devm_drm_bridge_alloc() API") split tc_probe_bridge_endpoint() in two
functions, thus duplicating the loop over the endpoints in each of those
functions. However it missed duplicating the of_graph_parse_endpoint() call
which initializes the struct of_endpoint, resulting in an uninitialized
read.

Fixes: a59a27176914 ("drm/bridge: tc358767: convert to devm_drm_bridge_alloc() API")
Cc: stable@vger.kernel.org
Reported-by: Colin King (gmail) <colin.i.king@gmail.com>
Closes: https://lore.kernel.org/all/056b34c3-c1ea-4b8c-9672-c98903ffd012@gmail.com/
Reviewed-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
- Link to v1: https://lore.kernel.org/r/20250703-drm-bridge-alloc-fix-tc358767-regression-v1-1-8f224cd063c4@bootlin.com
---

Changes in v2:
- fix 'Closes:' tag URL
- add 'Cc: stable@vger.kernel.org'
---
 drivers/gpu/drm/bridge/tc358767.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 61559467e2d22b4b1b4223c97766ca3bf58908fd..562fea47b3ecf360e64a414e95ab5d645e610e9e 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -2422,6 +2422,7 @@ static int tc_probe_bridge_endpoint(struct tc_data *tc, enum tc_mode mode)
 	struct device_node *node = NULL;
 
 	for_each_endpoint_of_node(dev->of_node, node) {
+		of_graph_parse_endpoint(node, &endpoint);
 		if (endpoint.port == 2) {
 			of_property_read_u8_array(node, "toshiba,pre-emphasis",
 						  tc->pre_emphasis,

---
base-commit: b4cd18f485687a2061ee7a0ce6833851fc4438da
change-id: 20250703-drm-bridge-alloc-fix-tc358767-regression-536ea2861af6

Best regards,
-- 
Luca Ceresoli <luca.ceresoli@bootlin.com>

Re: [PATCH v2] drm/bridge: tc358767: fix uninitialized variable regression

[Dmitry Baryshkov]

On Fri, Jul 04, 2025 at 01:30:18AM +0200, Luca Ceresoli wrote:
> Commit a59a27176914 ("drm/bridge: tc358767: convert to
> devm_drm_bridge_alloc() API") split tc_probe_bridge_endpoint() in two
> functions, thus duplicating the loop over the endpoints in each of those
> functions. However it missed duplicating the of_graph_parse_endpoint() call
> which initializes the struct of_endpoint, resulting in an uninitialized
> read.
> 
> Fixes: a59a27176914 ("drm/bridge: tc358767: convert to devm_drm_bridge_alloc() API")
> Cc: stable@vger.kernel.org
> Reported-by: Colin King (gmail) <colin.i.king@gmail.com>
> Closes: https://lore.kernel.org/all/056b34c3-c1ea-4b8c-9672-c98903ffd012@gmail.com/
> Reviewed-by: Colin Ian King <colin.i.king@gmail.com>
> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
> ---
> - Link to v1: https://lore.kernel.org/r/20250703-drm-bridge-alloc-fix-tc358767-regression-v1-1-8f224cd063c4@bootlin.com
> ---
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry

Re: [PATCH v2] drm/bridge: tc358767: fix uninitialized variable regression

[Luca Ceresoli]

On Fri, 04 Jul 2025 01:30:18 +0200, Luca Ceresoli wrote:
> Commit a59a27176914 ("drm/bridge: tc358767: convert to
> devm_drm_bridge_alloc() API") split tc_probe_bridge_endpoint() in two
> functions, thus duplicating the loop over the endpoints in each of those
> functions. However it missed duplicating the of_graph_parse_endpoint() call
> which initializes the struct of_endpoint, resulting in an uninitialized
> read.
> 
> [...]

Applied, thanks!

[1/1] drm/bridge: tc358767: fix uninitialized variable regression
      commit: cb863540e7c756abe7e709673a3e073c6a7aa8c0

Best regards,
-- 
Luca Ceresoli <luca.ceresoli@bootlin.com>